our way. so the more we foe about them, the better we are prepared to deal with that possibility. for me, though, i think they're interesting, much more because of their scientific interest. they really are these windows into the very earliest solar system. they are materials left over from when the sun and the earth and the planets formed. and they've been sitting around in space for that past 4.5 billion years. and if we can find them, study them and figure out where they are and if we can study them we have learned a lot about our own origin. >> brown: briefly since you raised it we better reassure people because that fear of asteroids coming to earth, this bun is sort of stuck in place, right, because so that is not likely? >> this is a really good one to have found. because even though it has the same orbit as us, it can never come any closer to us than a certain distance because it's stuck by the-- never, okay, maybe in 20,000 years, we don't know what will happen thenment but for the foreseeable future it's going to be staying there. we are going to be watching it. it will be a really fun dance to watch.